<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
       <div id="app">
        <div>{{ text }}</div>
            <div :class="c"></div>
            <div :style="s"></div>
            <div :name="n"></div>
            <div :class="c" :style="s" :name="n">{{ text }}</div>
            <button @click="clickBtn">{{ count }}</button>
       </div>

</body>
<script src="https://cdn.jsdelivr.net/npm/vue@3.2.26/dist/vue.global.js"></script>
<script>
    const app = Vue.createApp({
        data(){
            return  {
                c: "c",
                s: 'color:red;',
                n: 'n',
                text: 'text',
                count: 1
            }
        },
        methods: {
            clickBtn(){
                this.count += 1
            }
        }
    })

    app.mount('#app')
</script>
</html>